cmov

block-buffer: improve `split_blocks` implementations (#1220) #728

Job	Run time
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.85.0)	14s
build (1.85.0, wasm32-unknown-unknown)	19s
test (x86_64-apple-darwin, macos-latest, 1.85.0)	27s
cross (aarch64-unknown-linux-gnu, stable)	42s
test (x86_64-pc-windows-msvc, windows-latest, 1.85.0)	38s
build (1.85.0, thumbv7em-none-eabi)	14s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.85.0, sudo apt update && sudo apt install gcc-mult...	45s
build (stable, thumbv7em-none-eabi)	21s
cross (powerpc-unknown-linux-gnu, 1.85.0)	38s
cross (powerpc-unknown-linux-gnu, stable)	38s
minimal-versions / minimal-versions	30s
cross (aarch64-unknown-linux-gnu, 1.85.0)	36s
build (stable, wasm32-unknown-unknown)	31s
	6m 33s

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